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HakaiInstitute / jsp-time-series-report

Juvenile salmon program annual time series
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Which seines from doubled effort to include? #13

Closed salmonsam closed 4 years ago

salmonsam commented 5 years ago

In the data_wrangle file, under the 'Migration Timing' chunk, you've removed the doubled up seines from the intensive sampling period. I'm just curious if you tried calculating catch/cumulative abundance using the opposite set of seines from that period and if it made any difference to the numbers/timing?

Br-Johnson commented 5 years ago

I haven't done anything other than remove the addittional seines:

https://github.com/HakaiInstitute/jsp-time-series/blob/b4f46e4addbf718f828bb356c3980e727b171042/scripts/data_wrangle.Rmd#L400

Br-Johnson commented 5 years ago

There needs to be some thought given to how to deal with these additional seines given that the cumulative abundance migration timing method relies on consistent effort within each season.

Perhaps resampling half the seines within our doubled effort period 1000 times to create an empirical distribution of catch abundances and then from that take a mean total catch for each species is the best way forward.

Br-Johnson commented 5 years ago

Salmon Sam isn't working on this anymore. And in our last meeting, we discussed that re-sampling isn't needed. Likely we just need to average the catch of each species from the same site in the same week. @sarah-friesen are you keen to take this on?

jclgan commented 4 years ago

Averaged the catch totals of the double-effort seines from 2019 so that sampling effort is treated as consistent within the year